EP2664715B1 - Construction machine - Google Patents
Construction machine Download PDFInfo
- Publication number
- EP2664715B1 EP2664715B1 EP12734171.7A EP12734171A EP2664715B1 EP 2664715 B1 EP2664715 B1 EP 2664715B1 EP 12734171 A EP12734171 A EP 12734171A EP 2664715 B1 EP2664715 B1 EP 2664715B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- aqueous urea
- urea tank
- disposed
- battery
- engine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000010276 construction Methods 0.000 title claims description 45
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims description 164
- 239000004202 carbamide Substances 0.000 claims description 164
- 238000011144 upstream manufacturing Methods 0.000 claims description 18
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 24
- 239000007789 gas Substances 0.000 description 18
- 238000006722 reduction reaction Methods 0.000 description 9
- 239000003054 catalyst Substances 0.000 description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000001816 cooling Methods 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 230000005484 gravity Effects 0.000 description 4
- 238000002347 injection Methods 0.000 description 4
- 239000007924 injection Substances 0.000 description 4
- 239000003921 oil Substances 0.000 description 4
- 230000002452 interceptive effect Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000010420 art technique Methods 0.000 description 1
- 238000009412 basement excavation Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/08—Superstructures; Supports for superstructures
- E02F9/0858—Arrangement of component parts installed on superstructures not otherwise provided for, e.g. electric components, fenders, air-conditioning units
- E02F9/0866—Engine compartment, e.g. heat exchangers, exhaust filters, cooling devices, silencers, mufflers, position of hydraulic pumps in the engine compartment
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/30—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
- E02F9/08—Superstructures; Supports for superstructures
- E02F9/0858—Arrangement of component parts installed on superstructures not otherwise provided for, e.g. electric components, fenders, air-conditioning units
- E02F9/0883—Tanks, e.g. oil tank, urea tank, fuel tank
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2340/00—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses
- F01N2340/04—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses characterised by the arrangement of an exhaust pipe, manifold or apparatus in relation to vehicle frame or particular vehicle parts
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2590/00—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines
- F01N2590/08—Exhaust or silencing apparatus adapted to particular use, e.g. for military applications, airplanes, submarines for heavy duty applications, e.g. trucks, buses, tractors, locomotives
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N2610/00—Adding substances to exhaust gases
- F01N2610/14—Arrangements for the supply of substances, e.g. conduits
Definitions
- the present invention relates to a construction machine having an aqueous urea tank for storing aqueous urea that purifies exhaust gas discharged from an engine, and a battery for supplying electric power to the engine.
- a construction machine with the features of the preamble portion of patent claim 1 has been described in EP 2 226 478 A1 , which is a family member of JP 2009-138526 A .
- a construction machine such as a hydraulic excavator is generally provided with a travel base which has a crawler belt or the like to travel, a turning upperstructure which is disposed above the travel base and connected thereto through a turning frame so as to turn in a left/right direction, and a work device which is provided in front of the turning upperstructure, such as a front work device which has actuators so as to perform work such as excavation.
- the construction machine has a counterweight which is provided at the rear of the turning upperstructure, and an engine room which is disposed in front of the counterweight.
- the engine room has an engine, a heat exchanger which exchanges heat with the engine, an intake port which is formed in the exterior of the engine room to take in the outside air therethrough, a fan which introduces the outside air from the intake port into the engine room to cool the heat exchanger, and a tail pipe which is provided on the exterior of the engine room to release exhaust gas discharged from the engine to the outside.
- the construction machine has an exhaust gas purifying device in the engine room.
- the exhaust gas purifying device reduces and purifies nitrogen oxide contained in exhaust gas.
- the aqueous urea tank may be disposed near a device such as the engine or the hydraulic pump generating heat in the engine room so as to prevent the aqueous urea stored in the aqueous urea tank from being frozen due to the temperature decrease of the outside air.
- the aqueous urea tank may be disposed within the counterweight in order to acquire a space in the engine room.
- a construction machine in which a heat exchanger, a fan disposed to face the heat exchanger so as to generate cooling wind for accelerating heat release from the heat exchanger, and an aqueous urea tank for storing a liquid reductant, that is, aqueous urea to be supplied to an NOx reduction catalyst are provided in a machine room, and the aqueous urea tank is disposed on an upstream side of the heat exchanger in the flow direction of the cooling wind, in order to prevent the aqueous urea in the aqueous urea tank from reaching a high temperature (forexample, see JP 2009-138526 or EP 2 226 478 A1 being a family member thereof) .
- the aqueous urea tank releases heat to the cooling wind which has not yet passed the heat exchanger, so that the temperature rise of the aqueous urea in the aqueous urea tank can be suppressed while the aqueous urea can be prevented from being frozen.
- EP 2 226 478 A1 discloses a construction machine comprising: a turning upperstructure which is provided with a work device in the front thereof; a counterweight which is disposed at the rear of the turning upperstructure; an engine room which is disposed in front of the counterweight; an engine which is disposed within the engine room; a heat exchanger which exchanges heat with the engine; an intake port which is formed in the exterior of the engine room to take in outside air therethrough; a fan which introduces the outside air from the intake port into the engine room to cool the heat exchanger; a tail pipe which is disposed on the exterior of the engine room to release exhaust gas discharged from the engine to the outside; an aqueous urea tank which stores aqueous urea that purifies the exhaust gas discharged from the engine; and a battery.
- a construction machine such as a hydraulic excavator is generally provided with a battery for supplying electric power to devices such as an engine, and the battery is mounted within a turning upperstructure.
- the battery is placed in a portion that may reach a high temperature, for example, near a device such as an engine or a hydraulic pump generating heat, in the same manner as the aforementioned background-art aqueous urea tank for the construction machine disclosed in JP 2009-138526 A . It is therefore necessary to make consideration about the layout of the battery within the turning upperstructure.
- the battery is placed in a tool box in a front portion of the vehicle body.
- the construction machine is middle-sized or larger, the battery may be able to be placed in the tool box in the front portion of the vehicle body.
- devices such as a control valve have been already placed in the tool box in the front portion of the vehicle body when the construction machine is a small-sized construction machine such as a small turning type hydraulic excavator. It is therefore difficult to place the battery in the tool box.
- a recess portion for storing an aqueous urea tank is provided in a counterweight in a small-sized construction machine such as a small turning type hydraulic excavator, and the aqueous urea tank is placed in the recess portion of the counterweight so as to secure a space for placing a battery in an engine room.
- a small-sized construction machine such as a small turning type hydraulic excavator
- the tail radius of the small-sized construction machine such as a small turning type hydraulic excavator is reduced so that the counterweight does not have a large thickness . Therefore, it is difficult to secure the recess portion with a volume large enough to store the aqueous urea tank in the counterweight.
- a cast counterweight having a high specific gravity is used to reduce the tail radius. Therefore, even when the aqueous urea tank can be placed in the recess portion which is provided in the counterweight, there is a fear that the vehicle body becomes unstable because the aqueous urea tank having a different specific gravity is mounted in the recess portion of the counterweight.
- the layout of the battery is not taken into consideration, but the importance of the layout of the aqueous urea tank and the battery grows particularly in a small-sized construction machine such as a small turning type hydraulic excavator.
- An object of the invention is to provide a construction machine in which the temperature of a battery and aqueous urea within an aqueous urea tank can be prevented from rising and high stability can be secured in the vehicle body.
- the outside air is taken into the engine room through the intake port formed in the exterior of the engine room so that the temperature on the upstream side of the heat exchanger in the flow direction of the outside air may be made close to the temperature of the atmosphere by the taken-in outside air.
- the aqueous urea tank and the battery can be cooled by the outside air taken in through the intake port even if the aqueous urea tank and the battery are disposed in a portion which may reach a high temperature in the engine room, for example, near a device such as the engine or the hydraulic pump generating heat. It is therefore possible to suppress the temperature rise in the aqueous urea within the aqueous urea tank and the battery.
- both the aqueous urea tank and the battery are placed in the engine room so that the counterweight can ensure enough weight to keep balance in the vehicle body.
- the balance in the vehicle body can be kept even when the construction machine is provided with both the aqueous urea tank and the battery. In this manner, the temperature rise in the aqueous urea within the aqueous urea tank and the battery can be suppressed while high stability can be secured in the vehicle body.
- a construction machine in the aforementioned configuration, characterized in that: the battery is disposed on a side more closely to the work device than the aqueous urea tank. With the configuration made thus, a space for placing the aqueous urea tank therein is secured at the rear of the battery, that is, on a side more closely to the counterweight than the battery.
- the counterweight provided in a small-sized construction machine such as a small turning type hydraulic excavator has a shape with complicated irregularities internally in order to secure predetermined weight.
- the aqueous urea tank is, for example, molded out of a synthetic resin material with a high corrosion resistance or molded out of stainless steel or the like.
- the aqueous urea tank has a degree of freedom in its shape.
- the shape of the aqueous urea tank can be set in conformity to the irregular shape of the counterweight in the aforementioned space in which the aqueous urea tank is disposed.
- a new dead space can be prevented from being formed due to both the aqueous urea tank and the battery disposed on the upstream side of the heat exchanger in the flow direction of the outside air.
- the space within the engine room can be used effectively.
- a construction machine in the aforementioned configuration, characterized in that: the battery is disposed between the aqueous urea tank and the heat exchanger.
- the aqueous urea tank is disposed on an outer side than the battery, that is, on a side more closely to the exterior of the engine room. Accordingly, when an openable and closeable door for maintenance work which is formed, for example, in the exterior of the engine room and on the upstream side of the heat exchanger in the flow direction of the outside air is opened, one can stretch his/her hand to the supply port of the aqueous urea tank easily. In this manner, it is possible to save the labor and time required for the maintenance work including supply with aqueous urea etc. in the aqueous urea tank.
- a construction machine in the aforementioned configuration, characterized in that: another battery the same as the battery is further provided; and one of the two batteries is disposed above the other battery.
- a first embodiment of a construction machine according to the invention is, for example, applied to a small turning type hydraulic excavator 1 as shown in Fig. 1 .
- the hydraulic excavator 1 has a travel base 2, a turning upperstructure 3 disposed on an upper side of the travel base 2 and having a turning frame 3a, and a swing device such as a front work device 4 attached to the front of the turning upperstructure 3 so as to swing to an up/down direction.
- the turning upperstructure 3 has a cab 7 in the front thereof and a counterweight 6 at the rear thereof.
- the turning upperstructure 3 also has an engine room 5 between the cab 7 and the counterweight 6.
- the engine room 5 has an openable and closeable door 14 which can be opened and closed in a left/right direction by means of not-shown hinges in a left front portion.
- An intake port 5b for taking the outside air into the engine room 5 is provided in the openable and closeable door 14.
- the intake port 5b is provided in the exterior of the engine room 5 and in an upper portion of the openable and closeable door 14.
- the intake port 5b is formed into a plurality of slits which are set to be long and narrow to prevent large dusts from entering the engine room 5 together with the outside air.
- a grip 14a is attached to the openable and closeable door 14 of the engine room 5 and between the intake port 5b and the counterweight 6.
- the engine room 5 includes an engine 5a, a heat exchanger 15 which exchanges heat with the engine 5a, the aforementioned intake port 5b which is formed in the exterior of the engine room 5 to take in the outside air therethrough, a fan 16 which is provided at a closer end to the heat exchanger 15 of opposite ends of the engine 5a so as to introduce the outside air into the engine room 5 from the intake port 5b to thereby cool the heat exchanger 15, a tail pipe 20 which is provided on the exterior of the engine room 5 to release exhaust gas discharged from the engine 5a to the outside, and a hydraulic pump 8 which is provided at the other end on the opposite side to the fan 16 of the opposite ends of the engine 5a so as to supply pressure oil to the front work device 4.
- the fan 16 is connected to the engine 5a through a not-shown pulley so that the fan 16 can rotate due to the drive power of the engine 5a.
- the heat exchanger 15 has, for example, a radiator which cools cooling water for the engine 5a, an oil cooler which cools hydraulic oil for operating the front work device 4, and an intercooler which cools the intake air for the engine 5a. These radiator, oil cooler and intercooler are provided side by side in a front/rear direction of the turning upperstructure 3 and supported erectly by a frame fixed on the turning frame 3a.
- the heat exchanger 15 separates a room where the engine 5a, the fan 16 and the hydraulic pump 8 are disposed from a room where the aqueous urea tank 12 and batteries 13a and 13b are disposed as will be described later.
- the fan 16 rotates so that the outside air flows into the engine room 5 through the intake port 5b formed in the exterior of the engine room 5. Then, the outside air flowing in is delivered to the heat exchanger 15 so as to cool the radiator, the oil cooler and the intercooler of the heat exchanger 15. After that, the outside air is delivered to the engine 5a and the hydraulic pump 8 so as to cool the engine 5a and the hydraulic pump 8, and delivered to the outside through the outlet port formed in the exterior of the engine room 5.
- the counterweight 6 disposed at the rear of the turning upperstructure 3 of the small turning type hydraulic excavator 1 has a shorter tail radius than a standard type hydraulic excavator.
- the counterweight 6 has a recess portion 6a largely sinking inward and is removably attached to the engine room 5.
- the counterweight 6 is, for example, molded out of casting to keep balance in the vehicle body. That is, the shape, weight, etc. of the counterweight 6 are adjusted to set the gravity center of the vehicle body near the center of the turning upperstructure 3 so as to prevent the vehicle body from tilting frontward due to the weight of the front work device 4.
- the engine room 5 has the aforementioned aqueous urea tank 12 for storing aqueous urea that purifies exhaust gas discharged from the engine 5a, and two batteries 13a and 13b for supplying electric power to the engine 5a as shown in Figs. 2 and 3 .
- the aqueous urea tank 12 and the two batteries 13a and 13b are disposed together on an upstream side of the heat exchanger 15 in a flow direction of the outside air (on an upstream side in a flow direction B of cooling wind, and the same thing can be applied to the following description) . That is, in the first embodiment of the invention, the aqueous urea tank 12 and the batteries 13a and 13b are disposed among the openable and closeable door 14 of the engine room 5, the heat exchanger 15 and the counterweight 6.
- the two batteries 13a and 13b are disposed on a side more closely to the front work device 4 than the aqueous urea tank 12. That is, the aqueous urea tank 12 is disposed at the rear of the two batteries 13a and 13b in the front/rear direction of the batteries 13a and 13b and the turning upperstructure 3.
- each battery 13a, 13b has a rectangular parallelepiped shape and is set to have the same size and the same battery capacity as the other battery.
- These batteries 13a and 13b are disposed in such a manner that longitudinal side faces of the side faces of their rectangular parallelepipeds are opposed to each other.
- a supply port 12a for supplying aqueous urea is provided in an upper portion of the aqueous urea tank 12.
- the supply port 12a is disposed on the openable and closeable door 14 side of the engine room 5.
- the aforementioned aqueous urea tank 12 is, for example, molded out of a synthetic resin material with a high corrosion resistance or molded out of stainless steel or the like.
- the shape and size of the aqueous urea tank 12 are set in advance so that the aqueous urea tank 12 can be received in a space among the two batteries 13a and 13b, the openable and closeable door 14, the heat exchanger 15 and the counterweight 6.
- the tail side of the aqueous urea tank 12 is molded in conformity to the shape of the recess portion 6a of the counterweight 6.
- the top face of the aqueous urea tank 12 has a trapezoidal shape with rounded corner portions as shown in Fig. 2
- each side face of the aqueous urea tank 12 has a rectangle with rounded corner portions as shown in Fig. 3 .
- the height of the aqueous urea tank 12 is set to be larger than the height of each battery 13a, 13b.
- the aqueous urea tank 12 is fixed onto the turning frame 3a by, for example, a not-shown securing band or the like so as not to move.
- the engine room 5 also has an exhaust duct which connects the engine 5a with the tail pipe 20 so as to introduce the exhaust gas discharged from the engine 5a to the exhaust port 20, a reduction catalyst which is provided in the exhaust duct, and an injection device which is disposed in the exhaust duct and on an upstream side of the reduction catalyst so as to inject the aqueous urea supplied from the aqueous urea tank 12 into the exhaust duct. Harmful nitrogen oxide contained in the exhaust gas is decomposed to harmless water and nitrogen by reduction reaction with ammonia produced from the aqueous urea injected by the injection device in the reduction catalyst.
- the outside air is taken into the engine room 5 through the slit-like intake port 5b formed in the openable and closeable door 14 of the engine room 5 so that the temperature in the space on an upstream side of the heat exchanger 15 in the flow direction of the outside air, that is, between the openable and closeable door 14 of the engine room 5 and the heat exchanger 15 may be made close to the temperature of the atmosphere by the taken-in outside air.
- the aqueous urea tank 12 and the two batteries 13a and 13b when both the aqueous urea tank 12 and the two batteries 13a and 13b are disposed in the space between the openable and closeable door 14 of the engine room 5 and the heat exchanger 15, the aqueous urea tank 12 and the two batteries 13a and 13b can be cooled by the outside air taken in through the intake port 5b even if the aqueous urea tank 12 and the two batteries 13a and 13b are placed in a portion which may reach a high temperature in the engine room 5, for example, near a device such as the engine 5a or the hydraulic pump 8 generating heat. Thus, the temperature rise in the aqueous urea within the aqueous urea tank 12 and the batteries 13a and 13b can be suppressed.
- the counterweight 6 can ensure enough weight to keep balance in the vehicle body. Further, since the aqueous urea tank 12 and the two batteries 13a and 13b are placed within the engine room 5, the weight of the front work device 4 and the weight of the counterweight 6 are balanced so that the displacement of the gravity center located near the center of the turning upperstructure 3 can be suppressed. Thus, the balance in the vehicle body can be kept even when the small turning type hydraulic excavator 1 has the aqueous urea tank 12 and the batteries 13a and 13b.
- the temperature rise in the aqueous urea within the aqueous urea tank 12 and the batteries 13a and 13b can be suppressed while high stability can be secured in the vehicle body. It is therefore possible to improve the reliability of the small turning type hydraulic excavator 1 having the aqueous urea tank 12 and the batteries 13a and 13b.
- the two batteries 13a and 13b are provided side by side on a side more closely to the front work device 4 than the aqueous urea tank 12. Accordingly, as shown in Fig. 3 , the portion above the aqueous urea tank 12 and the batteries 13a and 13b is open. Therefore, even if both the aqueous urea tank 12 and the batteries 13a and 13b are disposed on the upstream side of the heat exchanger 15 in the flow direction of the outside air, the aqueous urea tank 12 and the batteries 13a and 13b can be prevented from interfering with the flow of the outside air flowing into the engine room 5 through the intake port 5b. In this manner, an enough flow rate of the outside air can be delivered to the heat exchanger 15, the engine 5a and the hydraulic pump 8 through the intake port 5b.
- Fig. 4 is a view showing the internal configuration of a turning upperstructure provided in a second embodiment of a construction machine according to the invention.
- Fig. 5 is an interior view of the turning upperstructure taken in the direction of an arrow A shown in Fig. 4 for explaining the layout of an aqueous urea tank and batteries provided in the second embodiment of the invention shown in Fig. 4 .
- the second embodiment of the invention is different from the aforementioned first embodiment as follows. That is, in the first embodiment, the two batteries 13a and 13b are disposed on a side more closely to the front work device 4 than the aqueous urea tank 12 as shown in Figs. 2 and 3 , whereas in the second embodiment, the two batteries 13a and 13b are disposed between an aqueous urea tank 22 and the heat exchanger 15 as shown in Figs. 4 and 5 .
- the two batteries 13a and 13b are disposed in such a manner that lateral side faces of the side faces of their rectangular parallelepipeds are opposed to each other. Further, the batteries 13a and 13b are provided side by side so that the longitudinal directions of the top faces of the rectangular parallelepipeds are parallel to the front/rear direction of the turning upperstructure 3. In addition, the batteries 13a and 13b are disposed adjacently to the heat exchanger 15, and the aqueous urea tank 22 is disposed in a space between the openable and closeable door 14 of the engine room 5 and the batteries 13a and 13b.
- the shape and size of the aqueous urea tank 22 are set in advance so that the aqueous urea tank 22 can be received in the aforementioned space among the two batteries 13a and 13b, the openable and closeable door 14 and the counterweight 6.
- the top face of the aqueous urea tank 22 is shaped into a rectangle with rounded corner portions as shown in Fig. 4
- each side face of the aqueous urea tank 22 is shaped into a rectangle with rounded corner portions as shown in Fig. 5 .
- the height of the aqueous urea tank 22 is set to be smaller than the height of each battery 13a, 13b.
- the other configuration is the same as that in the first embodiment.
- the two batteries 13a and 13b are disposed between the aqueous urea tank 22 and the heat exchanger 15 so that the aqueous urea tank 22 is disposed on an outer side than the batteries 13a and 13b, that is, on a side more closely to the openable and closeable door 14 of the engine room 5.
- the grip 14a provided in the openable and closeable door 14 is held to open the openable and closeable door 14, one can stretch his/her hand to a supply port 22a of the aqueous urea tank 22 easily.
- the height of the aqueous urea tank 22 is set to be smaller than the height of each battery 13a, 13b, it is easy to inject the aqueous urea into the supply port 22a of the aqueous urea tank 22 from the outside of the turning upperstructure 3. In this manner, the labor and time required for the maintenance work including supply with the aqueous urea etc. in the aqueous urea tank 22 can be saved so that user-friendliness in the maintenance work can be enhanced.
- Fig. 6 is a view showing the internal configuration of a turning upperstructure provided in a third embodiment of a construction machine according to the invention.
- Fig. 7 is an interior view of the turning upperstructure taken in the direction of an arrow A shown in Fig. 6 for explaining the layout of an aqueous urea tank and batteries provided in the third embodiment of the invention shown in Fig. 6 .
- Fig. 8 is a view showing the configuration of a support base provided in the third embodiment of the invention shown in Fig. 7 .
- the third embodiment of the invention is different from the aforementioned first embodiment as follows. That is, in the first embodiment, the two batteries 13a and 13b are disposed on a side more closely to the front work device 4 than the aqueous urea tank 12 as shown in Figs. 2 and 3 , whereas in the third embodiment, the two batteries 13a and 13b are disposed above an aqueous urea tank 23 as shown in Figs. 6 and 7 .
- a support base 17 for supporting the batteries 13a and 13b from below is provided.
- the support base 17 is constituted by a rectangular flat plate 17a on which the batteries 13a and 13b will be mounted, four supports 17b which are disposed in four corner portions of the flat plate 17a and provided perpendicularly to the flat plate 17a respectively, and four support pieces 17c which support the flat plate 17a and the supports 17b respectively.
- the batteries 13a and 13b are disposed in such a manner that longitudinal side faces of the side faces of their rectangular parallelepipeds are opposed to each other in the same manner as in the first embodiment. Further, the batteries 13a and 13b are provided side by side on the flat plate 17a of the support base 17 so that the longitudinal directions of the top faces of the rectangular parallelepipeds are parallel to the front/rear direction of the turning upperstructure 3. The batteries 13a and 13b are fixed onto the flat plate 17a of the support base 17 by, for example, not-shown securing bands or the like so as not to move.
- the aqueous urea tank 23 is disposed under the flat plate 17a of the support base 17.
- a space corresponding to the size of the batteries 13a and 13b can be ensured newly on the turning frame 3a in comparison with the case where the aqueous urea tank 12, 22 and the batteries 13a and 13b are disposed side by side as in the first or second embodiment. Accordingly, the volume of the aqueous urea tank 23 can be set to be larger by the space corresponding to the size of the batteries 13 and 13b and secured on the turning frame 3a. In this manner, an enough quantity of aqueous urea can be stored in the aqueous urea tank 23.
- the height of the aqueous urea tank 23 is set to be smaller than the length of each support 17b of the support base 17 as described above, so that the height of the aqueous urea tank 23 can be suppressed even if the volume of the aqueous urea tank 23 is set to be large. Accordingly, the aqueous urea can be easily injected into the supply port 23a of the aqueous urea tank 23 from the outside of the turning upper structure 3 when the openable and closeable door 14 of the engine room 5 is opened. In this manner, it is possible to reduce the burden on a worker in maintenance work including supply with the aqueous urea etc.
- Fig. 9 is a view showing the internal configuration of a turning upperstructure provided in a fourth embodiment of a construction machine according to the invention.
- Fig. 10 is an interior view of the turning upperstructure taken in the direction of an arrow A shown in Fig. 9 for explaining the layout of an aqueous urea tank and batteries provided in the fourth embodiment of the invention shown in Fig. 9 .
- the fourth embodiment of the invention is different from the aforementioned first embodiment as follows. That is, in the first embodiment, the two batteries 13a and 13b are disposed on the turning frame 3a on a side more closely to the front work device 4 than the aqueous urea tank 12 as shown in Figs. 2 and 3 , whereas in the fourth embodiment, not only are the two batteries 13a and 13b disposed on a side more closely to the front work device 4 than the aqueous urea tank 12 in the same manner as in the first embodiment, but also one battery 13a of the two batteries 13a and 13b is disposed above the other battery 13b, for example, as shown in Figs. 9 and 10 .
- the support base 27 is disposed among the openable and closeable door 14, the heat exchanger 15, the counterweight 6 and an aqueous urea tank 24, so that the longitudinal direction of the flat plate 27a is perpendicular to the front/rear direction of the turning upperstructure 3.
- the back face of each support 27b is fixed to the turning frame 3a by welding or the like.
- one battery 13b of the two batteries 13a and 13b is disposed under the flat plate 27a of the support base 27 so that the longitudinal direction of the top face of its rectangular parallelepiped is perpendicular to the front/rear direction of the turning upperstructure 3, and the other battery 13a is disposed on the flat plate 27a of the support base 27 so that the longitudinal direction of the top face of its rectangular parallelepiped is perpendicular to the front/rear direction of the turning upperstructure 3.
- the battery 13b is fixed onto the turning frame 3a by, for example, a not-shown securing band or the like, and the battery 13a is fixed onto the flat plate 27a of the support base 27 by, for example, a not-shown securing band or the like.
- the other configuration is the same as that in the first embodiment.
- one battery 13a of the two batteries 13a and 13b is disposed above the other battery 13b by means of the support base 27, so that a space corresponding to the size of one battery 13a can be secured on the turning frame 3a in comparison with the case where the aqueous urea tank 12 and the two batteries 13a and 13b are disposed side by side on the turning frame 3a as in the first embodiment shown in Fig. 2 .
- the volume of the aqueous urea tank 24 can be set to be larger by the space corresponding to the size of one battery 13a and secured on the turning frame 3a so that an enough quantity of aqueous urea can be stored in the aqueous urea tank 24.
- aqueous urea tank 24 and the batteries 13a and 13b can be prevented from interfering with the flow of the outside air taken in through the intake port 5b in comparison with the case where the two batteries 13a and 13b are disposed above the aqueous urea tank 23 as in the third embodiment shown in Fig. 6 .
- the aforementioned first to third embodiments of the invention have been described in the case where the two batteries 13a and 13b are disposed on the upstream side of the heat exchanger 15 in the flow direction of the outside air.
- one battery or three or more batteries may be disposed on the upstream side of the heat exchanger 15 in the flow direction of the outside air.
- the size of the aqueous urea tank may be set so that the aqueous urea tank can be received in a space on the upstream side of the heat exchanger 15 in the flow direction of the outside air in the engine room 5.
- first to fourth embodiments of the invention have been described in the case where they are applied to the small turning type hydraulic excavator 1 as shown in Fig. 1 .
- the invention may be also applied to a construction machine such as a middle-sized or larger hydraulic excavator.
Description
- The present invention relates to a construction machine having an aqueous urea tank for storing aqueous urea that purifies exhaust gas discharged from an engine, and a battery for supplying electric power to the engine. A construction machine with the features of the preamble portion of patent claim 1 has been described in
EP 2 226 478 A1JP 2009-138526 A - A construction machine such as a hydraulic excavator is generally provided with a travel base which has a crawler belt or the like to travel, a turning upperstructure which is disposed above the travel base and connected thereto through a turning frame so as to turn in a left/right direction, and a work device which is provided in front of the turning upperstructure, such as a front work device which has actuators so as to perform work such as excavation. In addition, the construction machine has a counterweight which is provided at the rear of the turning upperstructure, and an engine room which is disposed in front of the counterweight.
- The engine room has an engine, a heat exchanger which exchanges heat with the engine, an intake port which is formed in the exterior of the engine room to take in the outside air therethrough, a fan which introduces the outside air from the intake port into the engine room to cool the heat exchanger, and a tail pipe which is provided on the exterior of the engine room to release exhaust gas discharged from the engine to the outside.
- Here, harmful nitrogen oxide is contained in the exhaust gas discharged from the engine. It is therefore necessary to reduce the nitrogen oxide to thereby decompose the nitrogen oxide into water and nitrogen and reduce the concentration of the nitrogen oxide contained in the exhaust gas before the exhaust gas is discharged to the atmosphere. To that end, the construction machine has an exhaust gas purifying device in the engine room. The exhaust gas purifying device reduces and purifies nitrogen oxide contained in exhaust gas.
- For example, this exhaust gas purifying device includes an aqueous urea tank for storing aqueous urea, a reduction catalyst provided in an exhaust duct, and an injection device disposed in the exhaust duct on an upstream side of the reduction catalyst to inject the aqueous urea supplied from the aqueous urea tank into the exhaust duct. The aqueous urea injected by the injection device is hydrolyzed by the heat of the exhaust gas so that nitrogen oxide contained in the exhaust gas can be decomposed to harmless water and nitrogen and purified by reduction reaction between ammonia produced by the hydrolysis and the nitrogen oxide in the reduction catalyst.
- For the aforementioned aqueous urea tank storing the aqueous urea that purifies the exhaust gas, various layouts have been proposed in consideration of the behavior of the aqueous urea, the dimensions of the aqueous urea tank etc. and in accordance with the usage site, purpose or the like of the construction machine. For example, since the melting point of the aqueous urea is about -11° C, the aqueous urea tank may be disposed near a device such as the engine or the hydraulic pump generating heat in the engine room so as to prevent the aqueous urea stored in the aqueous urea tank from being frozen due to the temperature decrease of the outside air. Alternatively, the aqueous urea tank may be disposed within the counterweight in order to acquire a space in the engine room.
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US 6 922 990 B2 ,JP 2005-139952 A EP 1 028 258 A1 all set out that, in the interest of maintaining a cooling effect on the battery, the battery should be placed upstream of the heat exchanger in each respective engine compartment. - Specifically, as one of background-art techniques about the construction machine provided with the aqueous urea tank, there has been known a construction machine in which a heat exchanger, a fan disposed to face the heat exchanger so as to generate cooling wind for accelerating heat release from the heat exchanger, and an aqueous urea tank for storing a liquid reductant, that is, aqueous urea to be supplied to an NOx reduction catalyst are provided in a machine room, and the aqueous urea tank is disposed on an upstream side of the heat exchanger in the flow direction of the cooling wind, in order to prevent the aqueous urea in the aqueous urea tank from reaching a high temperature (forexample, see
JP 2009-138526 EP 2 226 478 A1 - More specifically,
EP 2 226 478 A1 - Here, a construction machine such as a hydraulic excavator is generally provided with a battery for supplying electric power to devices such as an engine, and the battery is mounted within a turning upperstructure. However, it is not preferable that the battery is placed in a portion that may reach a high temperature, for example, near a device such as an engine or a hydraulic pump generating heat, in the same manner as the aforementioned background-art aqueous urea tank for the construction machine disclosed in
JP 2009-138526 A - Particularly when the aqueous urea tank is disposed on the upstream side of the heat exchanger in the flow direction of the cooling wind in the engine room as in the aforementioned background-art construction machine, it may be considered that the battery is placed in a tool box in a front portion of the vehicle body. When the construction machine is middle-sized or larger, the battery may be able to be placed in the tool box in the front portion of the vehicle body. However, devices such as a control valve have been already placed in the tool box in the front portion of the vehicle body when the construction machine is a small-sized construction machine such as a small turning type hydraulic excavator. It is therefore difficult to place the battery in the tool box.
- It can be also considered that a recess portion for storing an aqueous urea tank is provided in a counterweight in a small-sized construction machine such as a small turning type hydraulic excavator, and the aqueous urea tank is placed in the recess portion of the counterweight so as to secure a space for placing a battery in an engine room. However, in order to be able to perform work even in a narrow site, the tail radius of the small-sized construction machine such as a small turning type hydraulic excavator is reduced so that the counterweight does not have a large thickness . Therefore, it is difficult to secure the recess portion with a volume large enough to store the aqueous urea tank in the counterweight.
- Further, in the small-sized construction machine such as a small turning type hydraulic excavator, a cast counterweight having a high specific gravity is used to reduce the tail radius. Therefore, even when the aqueous urea tank can be placed in the recess portion which is provided in the counterweight, there is a fear that the vehicle body becomes unstable because the aqueous urea tank having a different specific gravity is mounted in the recess portion of the counterweight. Thus, in the aforementioned background-art construction machine disclosed in
JP 2009-138526 A - The present invention is accomplished in consideration of such actual circumstances of the background art. An object of the invention is to provide a construction machine in which the temperature of a battery and aqueous urea within an aqueous urea tank can be prevented from rising and high stability can be secured in the vehicle body.
- The aforementioned object is accomplished, according to the present invention, by a construction machine comprising the features of patent claim 1.
- Dependent claims are directed on features of preferred embodiments of the invention.
- According to the invention configured thus, the outside air is taken into the engine room through the intake port formed in the exterior of the engine room so that the temperature on the upstream side of the heat exchanger in the flow direction of the outside air may be made close to the temperature of the atmosphere by the taken-in outside air. Thus, when both the aqueous urea tank and the battery are disposed on the upstream side of the heat exchanger in the flow direction of the outside air, the aqueous urea tank and the battery can be cooled by the outside air taken in through the intake port even if the aqueous urea tank and the battery are disposed in a portion which may reach a high temperature in the engine room, for example, near a device such as the engine or the hydraulic pump generating heat. It is therefore possible to suppress the temperature rise in the aqueous urea within the aqueous urea tank and the battery.
- In addition, both the aqueous urea tank and the battery are placed in the engine room so that the counterweight can ensure enough weight to keep balance in the vehicle body. Thus, the balance in the vehicle body can be kept even when the construction machine is provided with both the aqueous urea tank and the battery. In this manner, the temperature rise in the aqueous urea within the aqueous urea tank and the battery can be suppressed while high stability can be secured in the vehicle body.
- In addition, according to the invention, there is provided a construction machine in the aforementioned configuration, characterized in that: the battery is disposed on a side more closely to the work device than the aqueous urea tank. With the configuration made thus, a space for placing the aqueous urea tank therein is secured at the rear of the battery, that is, on a side more closely to the counterweight than the battery. Here, the counterweight provided in a small-sized construction machine such as a small turning type hydraulic excavator has a shape with complicated irregularities internally in order to secure predetermined weight. In addition, the aqueous urea tank is, for example, molded out of a synthetic resin material with a high corrosion resistance or molded out of stainless steel or the like. Therefore, the aqueous urea tank has a degree of freedom in its shape. Thus, the shape of the aqueous urea tank can be set in conformity to the irregular shape of the counterweight in the aforementioned space in which the aqueous urea tank is disposed. In this manner, a new dead space can be prevented from being formed due to both the aqueous urea tank and the battery disposed on the upstream side of the heat exchanger in the flow direction of the outside air. Thus, the space within the engine room can be used effectively.
- In addition, according to the invention, there is provided a construction machine in the aforementioned configuration, characterized in that: the battery is disposed between the aqueous urea tank and the heat exchanger. With the configuration made thus, the aqueous urea tank is disposed on an outer side than the battery, that is, on a side more closely to the exterior of the engine room. Accordingly, when an openable and closeable door for maintenance work which is formed, for example, in the exterior of the engine room and on the upstream side of the heat exchanger in the flow direction of the outside air is opened, one can stretch his/her hand to the supply port of the aqueous urea tank easily. In this manner, it is possible to save the labor and time required for the maintenance work including supply with aqueous urea etc. in the aqueous urea tank.
- In addition, according to the invention, there is provided a construction machine in the aforementioned configuration, characterized in that: another battery the same as the battery is further provided; and one of the two batteries is disposed above the other battery. With the configuration made thus, a space corresponding to the size of one battery can be secured on the turning frame in comparison with the case where the aqueous urea tank and the two batteries are disposed side by side on the turning frame. Accordingly, for example, the volume of the aqueous urea tank can be set to be larger by the space corresponding to the size of one battery and secured on the turning frame. Thus, an enough quantity of aqueous urea can be stored in the aqueous urea tank. Further, in comparison with the case where the two batteries are disposed above the aqueous urea tank, the aqueous urea tank and the two batteries can be prevented from interfering with the flow of the outside air taken in through the intake port in the exterior of the engine room.
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Fig. 1 ] A side view showing a small turning type hydraulic excavator as a first embodiment of a construction machine according to the invention. - [
Fig. 2 ] A view showing the internal configuration of a turning upperstructure provided in the first embodiment of the construction machine according to the invention. - [
Fig. 3 ] An interior view of the turning upperstructure taken in the direction of an arrow A shown inFig. 2 for explaining the layout of an aqueous urea tank and batteries provided in the first embodiment of the invention shown inFig. 2 . - [
Fig. 4 ] A view showing the internal configuration of a turning upperstructure provided in a second embodiment of a construction machine according to the invention. - [
Fig. 5 ] An interior view of the turning upperstructure taken in the direction of an arrow A shown inFig. 4 for explaining the layout of an aqueous urea tank and batteries provided in the second embodiment of the invention shown inFig. 4 . - [
Fig. 6 ] A view showing the internal configuration of a turning upperstructure provided in a third embodiment of a construction machine according to the invention. - [
Fig. 7 ] An interior view of the turning upperstructure taken in the direction of an arrow A shown inFig. 6 for explaining the layout of an aqueous urea tank and batteries provided in the third embodiment of the invention shown inFig. 6 . - [
Fig. 8 ] A view showing the configuration of a support base provided in the third embodiment of the invention shown inFig. 7 . - [
Fig. 9 ] A view showing the internal configuration of a turning upperstructure provided in a fourth embodiment of a construction machine according to the invention. - [
Fig. 10 ] An interior view of the turning upperstructure taken in the direction of an arrow A shown inFig. 9 for explaining the layout of an aqueous urea tank and batteries provided in the fourth embodiment of the invention shown inFig. 9 . - Embodiments of a construction machine according to the invention will be described below with reference to the drawings.
- A first embodiment of a construction machine according to the invention is, for example, applied to a small turning type hydraulic excavator 1 as shown in
Fig. 1 . The hydraulic excavator 1 has atravel base 2, a turning upperstructure 3 disposed on an upper side of thetravel base 2 and having a turningframe 3a, and a swing device such as afront work device 4 attached to the front of the turning upperstructure 3 so as to swing to an up/down direction. In addition, the turning upperstructure 3 has a cab 7 in the front thereof and acounterweight 6 at the rear thereof. The turning upperstructure 3 also has anengine room 5 between the cab 7 and thecounterweight 6. - In addition, the
engine room 5 has an openable andcloseable door 14 which can be opened and closed in a left/right direction by means of not-shown hinges in a left front portion. Anintake port 5b for taking the outside air into theengine room 5 is provided in the openable andcloseable door 14. Specifically, theintake port 5b is provided in the exterior of theengine room 5 and in an upper portion of the openable andcloseable door 14. Theintake port 5b is formed into a plurality of slits which are set to be long and narrow to prevent large dusts from entering theengine room 5 together with the outside air. Agrip 14a is attached to the openable andcloseable door 14 of theengine room 5 and between theintake port 5b and thecounterweight 6. When thegrip 14a is pulled, the openable andcloseable door 14 is opened so that maintenance work or the like in theengine room 5 can be performed. Further, a not-shown outlet port through which the outside air taken into theengine room 5 through theintake port 5b can be delivered to the outside again is formed in the exterior of theengine room 5 and on an opposite side to theintake port 5b. - Further, as shown in
Fig. 2 , theengine room 5 includes anengine 5a, aheat exchanger 15 which exchanges heat with theengine 5a, theaforementioned intake port 5b which is formed in the exterior of theengine room 5 to take in the outside air therethrough, afan 16 which is provided at a closer end to theheat exchanger 15 of opposite ends of theengine 5a so as to introduce the outside air into theengine room 5 from theintake port 5b to thereby cool theheat exchanger 15, atail pipe 20 which is provided on the exterior of theengine room 5 to release exhaust gas discharged from theengine 5a to the outside, and ahydraulic pump 8 which is provided at the other end on the opposite side to thefan 16 of the opposite ends of theengine 5a so as to supply pressure oil to thefront work device 4. - Specifically, the
fan 16 is connected to theengine 5a through a not-shown pulley so that thefan 16 can rotate due to the drive power of theengine 5a. In addition, though not shown, theheat exchanger 15 has, for example, a radiator which cools cooling water for theengine 5a, an oil cooler which cools hydraulic oil for operating thefront work device 4, and an intercooler which cools the intake air for theengine 5a. These radiator, oil cooler and intercooler are provided side by side in a front/rear direction of the turning upperstructure 3 and supported erectly by a frame fixed on theturning frame 3a. Theheat exchanger 15 separates a room where theengine 5a, thefan 16 and thehydraulic pump 8 are disposed from a room where theaqueous urea tank 12 andbatteries - Thus, when the
engine 5a is driven in the small turning type hydraulic excavator 1, thefan 16 rotates so that the outside air flows into theengine room 5 through theintake port 5b formed in the exterior of theengine room 5. Then, the outside air flowing in is delivered to theheat exchanger 15 so as to cool the radiator, the oil cooler and the intercooler of theheat exchanger 15. After that, the outside air is delivered to theengine 5a and thehydraulic pump 8 so as to cool theengine 5a and thehydraulic pump 8, and delivered to the outside through the outlet port formed in the exterior of theengine room 5. - Here, the
counterweight 6 disposed at the rear of the turning upperstructure 3 of the small turning type hydraulic excavator 1 has a shorter tail radius than a standard type hydraulic excavator. For example, thecounterweight 6 has arecess portion 6a largely sinking inward and is removably attached to theengine room 5. In addition, thecounterweight 6 is, for example, molded out of casting to keep balance in the vehicle body. That is, the shape, weight, etc. of thecounterweight 6 are adjusted to set the gravity center of the vehicle body near the center of the turning upperstructure 3 so as to prevent the vehicle body from tilting frontward due to the weight of thefront work device 4. - In the first embodiment of the invention, the
engine room 5 has the aforementionedaqueous urea tank 12 for storing aqueous urea that purifies exhaust gas discharged from theengine 5a, and twobatteries engine 5a as shown inFigs. 2 and3 . Theaqueous urea tank 12 and the twobatteries heat exchanger 15 in a flow direction of the outside air (on an upstream side in a flow direction B of cooling wind, and the same thing can be applied to the following description) . That is, in the first embodiment of the invention, theaqueous urea tank 12 and thebatteries closeable door 14 of theengine room 5, theheat exchanger 15 and thecounterweight 6. - In the first embodiment of the invention, for example, the two
batteries front work device 4 than theaqueous urea tank 12. That is, theaqueous urea tank 12 is disposed at the rear of the twobatteries batteries battery batteries batteries batteries turning frame 3a by, for example, not-shown securing bands or the like so as not to move. - In addition, a
supply port 12a for supplying aqueous urea is provided in an upper portion of theaqueous urea tank 12. Thesupply port 12a is disposed on the openable andcloseable door 14 side of theengine room 5. Further, the aforementionedaqueous urea tank 12 is, for example, molded out of a synthetic resin material with a high corrosion resistance or molded out of stainless steel or the like. The shape and size of theaqueous urea tank 12 are set in advance so that theaqueous urea tank 12 can be received in a space among the twobatteries closeable door 14, theheat exchanger 15 and thecounterweight 6. To this end, the tail side of theaqueous urea tank 12 is molded in conformity to the shape of therecess portion 6a of thecounterweight 6. Thus, the top face of theaqueous urea tank 12 has a trapezoidal shape with rounded corner portions as shown inFig. 2 , and each side face of theaqueous urea tank 12 has a rectangle with rounded corner portions as shown inFig. 3 . The height of theaqueous urea tank 12 is set to be larger than the height of eachbattery aqueous urea tank 12 is fixed onto theturning frame 3a by, for example, a not-shown securing band or the like so as not to move. - Though not shown, the
engine room 5 also has an exhaust duct which connects theengine 5a with thetail pipe 20 so as to introduce the exhaust gas discharged from theengine 5a to theexhaust port 20, a reduction catalyst which is provided in the exhaust duct, and an injection device which is disposed in the exhaust duct and on an upstream side of the reduction catalyst so as to inject the aqueous urea supplied from theaqueous urea tank 12 into the exhaust duct. Harmful nitrogen oxide contained in the exhaust gas is decomposed to harmless water and nitrogen by reduction reaction with ammonia produced from the aqueous urea injected by the injection device in the reduction catalyst. - According to the first embodiment of the invention configured thus, the outside air is taken into the
engine room 5 through the slit-like intake port 5b formed in the openable andcloseable door 14 of theengine room 5 so that the temperature in the space on an upstream side of theheat exchanger 15 in the flow direction of the outside air, that is, between the openable andcloseable door 14 of theengine room 5 and theheat exchanger 15 may be made close to the temperature of the atmosphere by the taken-in outside air. Therefore, when both theaqueous urea tank 12 and the twobatteries closeable door 14 of theengine room 5 and theheat exchanger 15, theaqueous urea tank 12 and the twobatteries intake port 5b even if theaqueous urea tank 12 and the twobatteries engine room 5, for example, near a device such as theengine 5a or thehydraulic pump 8 generating heat. Thus, the temperature rise in the aqueous urea within theaqueous urea tank 12 and thebatteries - In addition, since both the
aqueous urea tank 12 and the twobatteries engine room 5, thecounterweight 6 can ensure enough weight to keep balance in the vehicle body. Further, since theaqueous urea tank 12 and the twobatteries engine room 5, the weight of thefront work device 4 and the weight of thecounterweight 6 are balanced so that the displacement of the gravity center located near the center of the turning upperstructure 3 can be suppressed. Thus, the balance in the vehicle body can be kept even when the small turning type hydraulic excavator 1 has theaqueous urea tank 12 and thebatteries aqueous urea tank 12 and thebatteries aqueous urea tank 12 and thebatteries - In addition, in the first embodiment of the invention, the two
batteries front work device 4 than theaqueous urea tank 12. Thus, a space for placing theaqueous urea tank 12 therein is ensured at the rear of thebatteries counterweight 6 than thebatteries aqueous urea tank 12 are set in conformity with the shape of therecess portion 6a largely sinking inward in thecounterweight 6 in this space and theaqueous urea tank 12 is placed in the space, a new dead space can be prevented from being formed due to both theaqueous urea tank 12 and thebatteries heat exchanger 15 in the flow direction of the outside air. Thus, the space within theengine room 5 can be used effectively. - In addition, in the first embodiment of the invention, the two
batteries front work device 4 than theaqueous urea tank 12. Accordingly, as shown inFig. 3 , the portion above theaqueous urea tank 12 and thebatteries aqueous urea tank 12 and thebatteries heat exchanger 15 in the flow direction of the outside air, theaqueous urea tank 12 and thebatteries engine room 5 through theintake port 5b. In this manner, an enough flow rate of the outside air can be delivered to theheat exchanger 15, theengine 5a and thehydraulic pump 8 through theintake port 5b. -
Fig. 4 is a view showing the internal configuration of a turning upperstructure provided in a second embodiment of a construction machine according to the invention.Fig. 5 is an interior view of the turning upperstructure taken in the direction of an arrow A shown inFig. 4 for explaining the layout of an aqueous urea tank and batteries provided in the second embodiment of the invention shown inFig. 4 . - The second embodiment of the invention is different from the aforementioned first embodiment as follows. That is, in the first embodiment, the two
batteries front work device 4 than theaqueous urea tank 12 as shown inFigs. 2 and3 , whereas in the second embodiment, the twobatteries aqueous urea tank 22 and theheat exchanger 15 as shown inFigs. 4 and5 . - In this case, the two
batteries batteries batteries heat exchanger 15, and theaqueous urea tank 22 is disposed in a space between the openable andcloseable door 14 of theengine room 5 and thebatteries aqueous urea tank 22 are set in advance so that theaqueous urea tank 22 can be received in the aforementioned space among the twobatteries closeable door 14 and thecounterweight 6. To this end, the top face of theaqueous urea tank 22 is shaped into a rectangle with rounded corner portions as shown inFig. 4 , and each side face of theaqueous urea tank 22 is shaped into a rectangle with rounded corner portions as shown inFig. 5 . The height of theaqueous urea tank 22 is set to be smaller than the height of eachbattery - According to the second embodiment of the invention configured thus, the two
batteries aqueous urea tank 22 and theheat exchanger 15 so that theaqueous urea tank 22 is disposed on an outer side than thebatteries closeable door 14 of theengine room 5. Thus, when thegrip 14a provided in the openable andcloseable door 14 is held to open the openable andcloseable door 14, one can stretch his/her hand to asupply port 22a of theaqueous urea tank 22 easily. Further, since the height of theaqueous urea tank 22 is set to be smaller than the height of eachbattery supply port 22a of theaqueous urea tank 22 from the outside of the turning upperstructure 3. In this manner, the labor and time required for the maintenance work including supply with the aqueous urea etc. in theaqueous urea tank 22 can be saved so that user-friendliness in the maintenance work can be enhanced. -
Fig. 6 is a view showing the internal configuration of a turning upperstructure provided in a third embodiment of a construction machine according to the invention.Fig. 7 is an interior view of the turning upperstructure taken in the direction of an arrow A shown inFig. 6 for explaining the layout of an aqueous urea tank and batteries provided in the third embodiment of the invention shown inFig. 6 .Fig. 8 is a view showing the configuration of a support base provided in the third embodiment of the invention shown inFig. 7 . - The third embodiment of the invention is different from the aforementioned first embodiment as follows. That is, in the first embodiment, the two
batteries front work device 4 than theaqueous urea tank 12 as shown inFigs. 2 and3 , whereas in the third embodiment, the twobatteries aqueous urea tank 23 as shown inFigs. 6 and7 . - Specifically, in the third embodiment of the invention, a
support base 17 for supporting thebatteries Fig. 8 , thesupport base 17 is constituted by a rectangularflat plate 17a on which thebatteries supports 17b which are disposed in four corner portions of theflat plate 17a and provided perpendicularly to theflat plate 17a respectively, and foursupport pieces 17c which support theflat plate 17a and thesupports 17b respectively. - In addition, as shown in
Fig. 6 , the longitudinal length of theflat plate 17a is set to be larger than the longitudinal length of the top face of eachbattery flat plate 17a is set to be larger than twice of the lateral length of the top face of eachbattery closeable door 14 of theengine room 5 and theheat exchanger 15. Thesupport base 17 is disposed among the openable andcloseable door 14, theheat exchanger 15 and thecounterweight 6, and the back face of eachsupport piece 17c is fixed to theturning frame 3a by welding or the like. - The
batteries batteries flat plate 17a of thesupport base 17 so that the longitudinal directions of the top faces of the rectangular parallelepipeds are parallel to the front/rear direction of the turning upperstructure 3. Thebatteries flat plate 17a of thesupport base 17 by, for example, not-shown securing bands or the like so as not to move. Theaqueous urea tank 23 is disposed under theflat plate 17a of thesupport base 17. - Accordingly, the shape and size of the
aqueous urea tank 23 are set in advance so that theaqueous urea tank 23 can be received in the space formed under theflat plate 17a of thesupport base 17. To this end, the top face of theaqueous urea tank 22 is shaped into a rectangle with rounded corner portions, and each side face of theaqueous urea tank 22 is shaped into a rectangle with rounded corner portions as shown inFig. 7 . The height of theaqueous urea tank 23 is set to be smaller than the length of eachsupport 17b of thesupport base 17. The other configuration is the same as that in the first embodiment. - According to the third embodiment of the invention configured thus, a space corresponding to the size of the
batteries turning frame 3a in comparison with the case where theaqueous urea tank batteries aqueous urea tank 23 can be set to be larger by the space corresponding to the size of thebatteries 13 and 13b and secured on theturning frame 3a. In this manner, an enough quantity of aqueous urea can be stored in theaqueous urea tank 23. - In addition, the height of the
aqueous urea tank 23 is set to be smaller than the length of eachsupport 17b of thesupport base 17 as described above, so that the height of theaqueous urea tank 23 can be suppressed even if the volume of theaqueous urea tank 23 is set to be large. Accordingly, the aqueous urea can be easily injected into thesupply port 23a of theaqueous urea tank 23 from the outside of the turning upper structure 3 when the openable andcloseable door 14 of theengine room 5 is opened. In this manner, it is possible to reduce the burden on a worker in maintenance work including supply with the aqueous urea etc. -
Fig. 9 is a view showing the internal configuration of a turning upperstructure provided in a fourth embodiment of a construction machine according to the invention.Fig. 10 is an interior view of the turning upperstructure taken in the direction of an arrow A shown inFig. 9 for explaining the layout of an aqueous urea tank and batteries provided in the fourth embodiment of the invention shown inFig. 9 . - The fourth embodiment of the invention is different from the aforementioned first embodiment as follows. That is, in the first embodiment, the two
batteries turning frame 3a on a side more closely to thefront work device 4 than theaqueous urea tank 12 as shown inFigs. 2 and3 , whereas in the fourth embodiment, not only are the twobatteries front work device 4 than theaqueous urea tank 12 in the same manner as in the first embodiment, but also onebattery 13a of the twobatteries other battery 13b, for example, as shown inFigs. 9 and10 . - In this case, according to the fourth embodiment of the invention, a
support base 27 having aflat plate 27a whose size is different from that of theflat plate 17a of thesupport base 17 is provided in place of thesupport base 17 provided in the third embodiment. That is, as shown inFig. 9 , the longitudinal length of theflat plate 27a is set to be a little larger than the longitudinal length of the top face of eachbattery closeable door 14 of theengine room 5 and theheat exchanger 15, and the lateral length of theflat plate 27a is set to be a little larger than the lateral length of the top face of eachbattery - The
support base 27 is disposed among the openable andcloseable door 14, theheat exchanger 15, thecounterweight 6 and anaqueous urea tank 24, so that the longitudinal direction of theflat plate 27a is perpendicular to the front/rear direction of the turning upperstructure 3. The back face of eachsupport 27b is fixed to theturning frame 3a by welding or the like. Thus, onebattery 13b of the twobatteries flat plate 27a of thesupport base 27 so that the longitudinal direction of the top face of its rectangular parallelepiped is perpendicular to the front/rear direction of the turning upperstructure 3, and theother battery 13a is disposed on theflat plate 27a of thesupport base 27 so that the longitudinal direction of the top face of its rectangular parallelepiped is perpendicular to the front/rear direction of the turning upperstructure 3. Thebattery 13b is fixed onto theturning frame 3a by, for example, a not-shown securing band or the like, and thebattery 13a is fixed onto theflat plate 27a of thesupport base 27 by, for example, a not-shown securing band or the like. The other configuration is the same as that in the first embodiment. - According to the fourth embodiment of the invention configured thus, one
battery 13a of the twobatteries other battery 13b by means of thesupport base 27, so that a space corresponding to the size of onebattery 13a can be secured on theturning frame 3a in comparison with the case where theaqueous urea tank 12 and the twobatteries turning frame 3a as in the first embodiment shown inFig. 2 . In this manner, the volume of theaqueous urea tank 24 can be set to be larger by the space corresponding to the size of onebattery 13a and secured on theturning frame 3a so that an enough quantity of aqueous urea can be stored in theaqueous urea tank 24. Further, theaqueous urea tank 24 and thebatteries intake port 5b in comparison with the case where the twobatteries aqueous urea tank 23 as in the third embodiment shown inFig. 6 . - The aforementioned first to third embodiments of the invention have been described in the case where the two
batteries heat exchanger 15 in the flow direction of the outside air. However, one battery or three or more batteries may be disposed on the upstream side of theheat exchanger 15 in the flow direction of the outside air. Also in this case, the size of the aqueous urea tank may be set so that the aqueous urea tank can be received in a space on the upstream side of theheat exchanger 15 in the flow direction of the outside air in theengine room 5. - In addition, the first to fourth embodiments of the invention have been described in the case where they are applied to the small turning type hydraulic excavator 1 as shown in
Fig. 1 . However, the invention may be also applied to a construction machine such as a middle-sized or larger hydraulic excavator. -
- 1
- small turning type hydraulic excavator (construction machine)
- 2
- travel base
- 3
- turning upperstructure
- 4
- front work device (work device)
- 5
- engine room
- 5a
- engine
- 5b
- intake port
- 6
- counterweight
- 7
- cab
- 8
- hydraulic pump
- 12, 22, 23, 24
- aqueous urea tank
- 12a, 22a, 23a, 24a
- supply port
- 13a, 13b
- battery
- 14
- openable and closeable door
- 14a
- grip
- 15
- heat exchanger
- 16
- fan
- 17,27
- support base
- 17a, 27a
- flat plate
- 17b, 27b
- support
- 17c, 27c
- support piece
- 20
- tail pipe
Claims (4)
- A construction machine (1) comprising: a turning upperstructure (3) which is provided with a work device (4) in the front thereof; a counterweight (6) which is disposed at the rear of the turning upperstructure (3); an engine room (5) which is disposed in front of the counterweight (6); an engine (5a) which is disposed within the engine room (5); a heat exchanger (15) which exchanges heat with the engine (5a); an intake port (5b) which is formed in the exterior of the engine room (5) to take in outside air therethrough; a fan (16) which introduces the outside air from the intake port (5b) into the engine room (5) to cool the heat exchanger (15); a tail pipe (20) which is disposed on the exterior of the engine room (5) to release exhaust gas discharged from the engine (5a) to the outside; an aqueous urea tank (12, 22, 23, 24) which stores aqueous urea that purifies the exhaust gas discharged from the engine (5a); and a battery (13a, 13b); characterized in that
the counterweight (6) has a recess portion (6a) which is formed by being recessed inward from a side of the counterweight (6) facing the engine (5a),
both the aqueous urea tank (12, 22, 23, 24) and the battery (13a, 13b) are disposed on an upstream side of the heat exchanger (15) in a flow direction of the outside air and the aqueous urea tank (12, 22, 23, 24) is molded in conformity with the shape of the recess portion (6a) of the counterweight (6). - A construction machine (1) according to Claim 1, wherein:
the battery (13a, 13b) is disposed on a side more closely to the work device (4) than the aqueous urea tank (12, 22, 23, 24). - A construction machine (1) according to Claim 1, wherein:
the battery (13a, 13b) is disposed between the aqueous urea tank (12, 22, 23, 24) and the heat exchanger (15). - A construction machine (1) according to Claim 1, wherein:another battery (13b), the same as the battery (13a), is further provided; andone of the two batteries (13a, 13b) is disposed above the other battery (13b, 13a).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011006234A JP5649463B2 (en) | 2011-01-14 | 2011-01-14 | Construction machinery |
PCT/JP2012/050260 WO2012096255A1 (en) | 2011-01-14 | 2012-01-10 | Construction machine |
Publications (3)
Publication Number | Publication Date |
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EP2664715A1 EP2664715A1 (en) | 2013-11-20 |
EP2664715A4 EP2664715A4 (en) | 2017-05-10 |
EP2664715B1 true EP2664715B1 (en) | 2019-10-30 |
Family
ID=46507155
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12734171.7A Active EP2664715B1 (en) | 2011-01-14 | 2012-01-10 | Construction machine |
Country Status (6)
Country | Link |
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US (1) | US9290906B2 (en) |
EP (1) | EP2664715B1 (en) |
JP (1) | JP5649463B2 (en) |
KR (1) | KR101882402B1 (en) |
CN (1) | CN103299003B (en) |
WO (1) | WO2012096255A1 (en) |
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JP6297905B2 (en) * | 2014-04-22 | 2018-03-20 | 日立建機株式会社 | Construction machinery |
JP6175405B2 (en) * | 2014-05-30 | 2017-08-02 | 日立建機株式会社 | Construction machinery |
JP6132273B2 (en) * | 2014-07-28 | 2017-05-24 | 日立建機株式会社 | Hybrid work machine |
KR102175689B1 (en) * | 2014-07-31 | 2020-11-09 | 글로벌웨이퍼스 씨오., 엘티디. | Nitrogen doped and vacancy dominated silicon ingot and thermally treated wafer formed therefrom having radially uniformly distributed oxygen precipitation density and size |
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DE102019106006A1 (en) * | 2019-03-08 | 2020-09-10 | Wacker Neuson Linz Gmbh | Working machine with electric drive and cooling device |
JP7274745B2 (en) * | 2019-11-22 | 2023-05-17 | 株式会社ササキコーポレーション | Self-propelled work machine |
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- 2012-01-10 CN CN201280005219.XA patent/CN103299003B/en active Active
- 2012-01-10 US US13/979,580 patent/US9290906B2/en active Active
- 2012-01-10 WO PCT/JP2012/050260 patent/WO2012096255A1/en active Application Filing
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KR101882402B1 (en) | 2018-07-26 |
US9290906B2 (en) | 2016-03-22 |
CN103299003A (en) | 2013-09-11 |
EP2664715A1 (en) | 2013-11-20 |
EP2664715A4 (en) | 2017-05-10 |
KR20140018233A (en) | 2014-02-12 |
JP2012144955A (en) | 2012-08-02 |
US20130294876A1 (en) | 2013-11-07 |
WO2012096255A1 (en) | 2012-07-19 |
JP5649463B2 (en) | 2015-01-07 |
CN103299003B (en) | 2015-07-22 |
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